Drawbar



F. A. PECK AND J. E. A. MOORE.

DRAWBAR.

APPLICATION FILED ILIIIE24, I92o.

Patented Apr. 5, 1921.

Ar 70E/vifs EaANx A. rEcx AND JAMES E. A.1MoonE,.oE CLEVELAND, 031%. f.

' nnAweAn.

Specication of Letters Patent.

Patented Apr. 5, i921.

original application led November 25, 1918, Serial No. 264,048. Divided and this application iiled June 24, 1920. Serial No. 391,457.

To all whom t may concern.

Be it known that we,'FRANx A. PEGK and JAMES E. A. MOORE, citizens of the United States, and residents of Cleveland, county of Cuyahoga and State of Ohio, have inf vented new and useful Improvements in Drawbars, of which the following is a speeliication, the principle of the invention be,

ing herein explained, and the best A.mode in which we have contemplated applymg that principle, so vas to distinguish it from other inventions.

The subject matter of this`application has been divided out of our application for U. S. Letters Patent on draw-bars, Serial No. 264,048, filed November 25, 1918.

Our invention relates to draw-bars, and particularly to a device of this character adapted to secure an agricultural implement to a tractor. The object of the invention is to design an improved lconnection for this purpose, and which shall also function automatically to render the tractor non-effective, when an overload is imposed upon the 1mplement, such as the encounterin `of anunusual obstruction in the path o the same.

The annexed drawing and the following description set forth in detail certain means embodying our invention, the dlsclosed means, however, constituting but one Aof the` various mechanical forms in which the principle of the invention mayv be applied.

In said annexed drawing:`

Figure 1 represents a central, vertical, longitudinal section of our improved drawbar and automatic release, taken in the plane indicated by the line 1 1, Fi 2;

Fig. 2 represents a centra horizontal, longitudinal section thereof, taken the plane indicated by the line II-IL Fig. 1;

Fig. 3 represents a view of fragmentary parts shown in Fig. 2, when moved sub-A stantially to their releasing position.

Referring to the annexed drawing, tractor and implement connections are shown having the draw-heads 1 and 2, respectively. The ldesign in eifect exibly joins together these two connections, the particular means therefor being a torsion spring 3 of the fiat coil variety in the form of device illustrated. However, the use of other forms of torsion springs, such as the conical coil, the elongated coil, or other varieties, would come within the spirit of my invention. The spring 3, Figs. 1 and 2, is contained within 'intersects the side a cylindrical casing comprising side plates i 5 and 6 and a body plate or member `7. These plates 5, 6 and 7 aesecured together by means of a plurality ofmachine screws i riorly of said plates is provided with jour- An extended bolt 10 also nal portions for bearing members formed at the ends of two arms 11 into which the drawfbar ment connection 2 is formed. The side plates 5 and 6 are also formed with enlarged centrally disposed bosses 12 forming bearings for an axle 13 extended outwardly somewhat at both ends from said bearings 12 and .secured to endl members 14', 14', formed 1 n the two yoke arms 14 into which an auxlllary intermediate draw-bar member 4 6 .1s formed, Fig. 2. Said' ends 14" are rlgidlysecured to the axle v13 by the machlne bolts 15. The flat torsion spring 3 is secured at lts inner end 16 tothe axle 13 and at'its outer larged bellied portions .19 of the members 5, 6 and 7 providingsuitable accommodation for this purpose. It is evident that the aforo-described design provides a., flexible connectlon between the tractor and implement connections 1 and 2; that casing rolling upon the axis of the bolt 10;

and that said cylindrical casing will rotate of'the cylindrical casing by a screw 45 and having an exterior cam surface, 1s a member 44. This surface is adapted to effect the release of certain jaws through the action of certain toggle links, hereinafter more j fully described, when the cylindrical casing has rotated an amount determined upon as a maxlmum before the tractor should be rendered non-eifective- The forward ends- 46 of the arms 14 are formed lwith beveled j awV guides 47. A pair of jaws 48lare formed comprising a yoke.

end of the imple end 17 to the bolt 10, en-

such iiexib1l1ty will be exercised by the cylindrical thel u per and lower portions of two these guides 47 and are pivote upnbolts Y extended t bolts 49 maybe actuated by Asteel rods 50 secured thereto. Two .palrs of toggle links 53 are pivot-ed at. thelr respectlve ends to of bo ts51'and154,-the outer ends o the links being ivoted to the bolts y51 and the inner ends o the links being pivoted-to the bolts v54 all as plainly shownv1n Figs. 2

and 3. Said bolts'l are secured within in-l \render wardl 48. i toggle guide 55. Saidtoggle guide 55 and the tractor connection 1 are normally spaced projecting portions 520i the jaws `la maximum distance apart throu h the tenand abutting against a shoulder 5.8 formed .55, gradually forcing said guide guides.

sion of a coil sprin .56 surroun ing a pin 57 forwardly exten ed from said gulde 55 in the draw-head 1. It is evident from the aforegoing description that a suicient rotation of the cylindrical casing will cause the cam surface 44 to bear upon thetoggle guide i orwardly. and ultimately resulting in the pulling together of the jaws 48 and the freeing of the same from the'beveled surfaces'47. .Then the pull of the tractor will result in the freeingof the vdraw-head1 andthe associated parts, plainl shown in Fig. 3, f'om the members 46. en it is-desired. to reconnect the parts, the jaws 48 and associated mechanisms are suliiciently manually actuated through the medium of the steel rods 50 to allow of the entrance of the jaws 48 within the space defined by the inner edges of the beveled guides 47 and the rods 50 then released.-

What we claim is l. A draw-bar comprisi a 'pair of coupling heads; a` torsion-spring whose ends arel respectively 'secured relatively to said heads; a movable member intermediate said heads and adapted to be moved amounts proportioned to the stress to vwhich said spring is subjected; movable jaws secured relatively t0 one of said heads; jaw uides, said jaws and guides interlocking sai movable member and said last-mentloned head; means for maintaining said jawsnormally eii'ective; and means supported upon said movable member and adapted, upon a predetermined movement of the same, to move said jaws to release the same from the 2. A draw-bar comprising, a pair of coupling heads; a torsion spring whose ends are respectively secured relatively to said heads; a pivotally mounted member whose moveweb and. upon both sides o the tractor connectlon 1.' These airs olts 54 intersect a centrally disposed which said-spring isisubjected means supported 1 by .saidl springffor supporting said cam surface, one cf. the coupling heads comprising. a" ytwo-part member having coperating movable jaws andjaw guides; toggle links secured to saidjaws; Vand means acting uponf said links ,for maintainingjsai'd jaws normally effective, saidrcamsurface, upon a predetermined amountv of movement o such pivoted member,

such last-mentioned means non-effective and to move said links positively to release said jaws. l f

. 3. A draw-bar comprising, a pair of co'upling heads; an axle; a member rotatably mounted upon said axle, one ofsaid coupling heads being pivotally secured to said member; a torsion spring. whose lends are Aments are the `V stress to member, the' latterbeing provided with al being adapted vto V respectively secured to said axle and said v member; a trip adjustably secured to'l said member; a membersecured at one end toV `said axle and formed 'at the other end with jaw guides; a pair of jaws pivotallv secured to the otherl coupling head vand adapted to 'coperate with said guides to interlock said last-mentioned member and said last-men'- tioned coupling head;'means for'maintaining said jaws normally effective; and movable suitably supported means disposed in the path of movement of said trip jiji' vr'eleasing said jaws'.

4.a draw-bar comprising, a pair of coupling heads; an axle; a vmember rotatably mounted upon said axle, one of said coupling heads. being nivotally secured to said member; a torsion spring whose ends are respectivelysecured tosaid axle and said member; a lug formed with a cam surface and adjustably secured to said member.; a member secured at one end to said. axle and formed at theother with jaw guides; a pair of jaws pivotally secured to theother coupling head and adapted to coperat'e withsaid guides to interlock said last-mentioned member and said last-mentioned coupling FRANK A. PECK. JAMES A. MOORE. 

